问题
选择题
If you want to prevent yourself from catching diseases, you must keep your living
environment _______. [ ]
A. clean
B. to clean
C. cleaning
D. dirty
答案
答案：A
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If you want to prevent yourself from catching diseases, you must keep your living
environment _______. [ ]
A. clean
B. to clean
C. cleaning
D. dirty
答案：A